Hypothesis |
A proposed explanation or prediction that can be tested through research. Example: This study hypothesizes that higher education is associated with greater political knowledge.
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Regression |
A statistical method that examines the relationship between two or more variables. Example: This study uses multiple regression analysis to determine the effect of education and income on voting behavior.
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Sample |
A smaller group of people or observations that are selected from a larger population in order to study the characteristics of the population as a whole. Example: The survey was conducted using a random sample of 1000 registered voters.
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Survey |
A research method that involves collecting data from people through self-report measures such as questionnaires or interviews. Example: The researchers conducted a national survey on attitudes toward gun control.
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Randomization |
The use of chance to assign participants to different groups in a study, in order to ensure that the groups are comparable and that the results are not influenced by pre-existing differences between the groups. Example: Participants were randomly assigned to either the treatment or control group.
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Probability |
The likelihood of a particular event happening, expressed as a number between 0 and 1. Example: The probability of a Democrat winning the election is currently estimated to be 0.7.
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Experiment |
A research method that involves manipulating one or more variables in order to determine their effect on another variable, while holding all other factors constant. Example: The researchers conducted a randomized experiment to test the effect of negative campaign ads on voter turnout.
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Correlation |
A statistical measure that indicates the degree to which two or more variables are related to each other. Example: There is a strong positive correlation between education and income.
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Confidence Interval |
A range of values within which a population parameter is estimated to lie, with a certain degree of confidence. Example: The survey found that 60% of respondents favored stricter gun control laws, with a 95% confidence interval of plus or minus 3%.
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Significance |
A statistical term that indicates whether an observed pattern or relationship is likely to be due to chance or to a real effect. Example: The study found a statistically significant difference in voting behavior between men and women.
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Variable |
Any factor that can change or vary in a research study. Example: The independent variable in this study is education, while the dependent variable is political knowledge.
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Panel Study |
A research design that involves studying the same individuals over a period of time, in order to examine changes in their attitudes, behavior, or other characteristics. Example: The researchers conducted a panel study of political attitudes among a group of college students over a four-year period.
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Causality |
The relationship between cause and effect, where one variable (the cause) brings about a change in another variable (the effect). Example: The study found a causal relationship between exposure to negative advertising and decreased voter turnout.
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Content Analysis |
A research method that involves systematically analyzing the content of media messages such as news articles, speeches or debates. Example: The study conducted a content analysis of presidential debates in order to examine the candidates' use of rhetorical strategies.
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Multicollinearity |
A statistical phenomenon that occurs when two or more independent variables in a regression model are highly correlated with each other, which can make it difficult to assess the unique effect of each variable on the dependent variable. Example: The study found that there was significant multicollinearity between education and income in predicting political knowledge.
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Control Group |
In an experiment, a group that does not receive the treatment or intervention being studied, but is otherwise similar to the treatment group. Example: The study randomly assigned participants to either the intervention group, which received a civics education program, or the control group, which received no intervention.
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Descriptive Statistics |
Statistical methods that summarize or describe the characteristics of a set of data, such as measures of central tendency or variability. Example: The researchers calculated the mean and standard deviation of political knowledge scores among different age groups.
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Observational Study |
A research design that involves observing and measuring variables without manipulating them, in order to examine naturally occurring patterns or relationships. Example: The study used an observational design to examine the relationship between religiosity and voting behavior.
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Confounding Variable |
A variable that can influence the relationship between the independent and dependent variables in a research study, potentially leading to incorrect conclusions about causality. Example: The study found a relationship between political knowledge and voting behavior, but failed to control for the confounding variable of age.
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